96 – Hyalodendron Diddens

Publisher Summary This chapter focuses on Hyalodendron genus and its member species. The colonies of this genus are dry, farinose to velvety, and white to cream-colored, and the budding cells and pseudomycelium are absent or rare. Hyphae are hyaline, coherent or locally disarticulating, and conidia arise in short chains and are ellipsoidal to cylindroidal with truncate ends. The only member species of this genus is Hyalodendron lignicola. The colonies of this species, after undergoing growth on potato carrot agar, for 10 days at 20–22° C, become dry, flat, farinose, white, and vaguely zonate. True hyphae are thin-walled, often flexuose, and profusely branched at acute angles. Conidia arise in lateral or terminal, mostly unbranched chains comprising up to 10 conidia, which are ellipsoidal with truncate ends or cylindroidal with slightly swollen median parts and measure. Pale olivaceous, firm-walled inflated cells up to 30 μm in diameter are occasionally present in old cultures. The species sporulates well on nutritionally poor media, and it has long been regarded as a hyphomycete since it forms dry colonies with true hyphae and mostly lacking budding cells.